tonight, senior national correspondent john roberts goes inside the tragic numbe numbers. >> just as the pentagon thought it was making headway on the military suicide, a troubling reversal. 349 active duty service members took their lives in 2012. sharp increase from the previous year's 301. >> more veterans to suicide, to combat. that should outrage all americans. if there was an enemy weapons system kill 300 troops a year we'd figure out how to eliminate that enemy. >> the mill their tried to address the problem. every branch has a comprehensive suicide prevention program. >> how many of you in here know of someone who committed suicide? >> after remaining relatively flat for three years in t number of suicides spiked to record highs. >> it's a constant struck to understand the riskbe factors at play. we are dealing with the post dramatic stress, dramatic brain injury. service members on tremendous prescription medication, with multiple surgeries. >> general peter corelli, vice chief of staff said it's a difficult issue to fully understand. >> i happen to believe that the departme